blocks|key|3042916|text|这是因为你笔记本电脑上的密钥库和原来的pc上的密钥库是不同的。它位于%25USER_HOME%25/.android/文件夹中，名为debug.keystrore。更具体地说，之所以会发生这种情况，是因为eclipse试图使用reinstall键来推送apk。所以你有两个选择|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3042917|3042918|在不同开发pc的|ordered-list-item|3042919|之间共享debug.keystore手动从设备卸载apk+(使用adb+)|3042920|3042921|entityMap^0|Y|L|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|R|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|S|8|@]|D|@]|E|$]]|$1|J|3|K|5|I|7|T|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

It happens because keystores on your laptop and original pc are different. it's called debug.keystrore
and located in <code>%USER_HOME%/.android/</code> folder. TO be more specific it happens because eclipse tries to push apk with reinstall key. So you have two options

<ol>
<li>Share debug.keystore between various development pc's</li>
<li>Manually uninstall your apk from device ( using adb )</li>
</ol>

blocks|key|3042983|text|我也遇到了同样的问题，并解决了它。您应该执行以下操作来修复它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3042984|3042985|如果您已经从手机上加载了该应用程序，请将其从手机上卸载。要卸载goto设置->应用程序->manage+application.|ordered-list-item|3042986|Run该应用程序，请再次选择移动|3042987|3042988|希望这能对你有所帮助|3042989|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

I also got the same problem and fixed it. you should do the following to fix it,

<ol>
<li>Uninstall the application from your mobile if you load it
already.</li>
<li>To uninstall goto settings->application->manage application.</li>
<li>Run the application again and choose the mobile</li>
</ol>

Hope this will help you

blocks|key|305007|text|将debug.keystore复制到PC后，需要在PC上重建项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|305008|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

After you copy debug.keystore to your PC, you need to rebuild project on PC.

blocks|key|307126|text|我在使用Droid模拟器时也遇到了同样的问题。我通过在仿真器的应用程序设置中卸载包解决了这个问题，就像您在普通设备上一样。在下一次运行时，它会重新安装，错误也会消失。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|307127|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had the same issue using the Droid emulator. I solved it by uninstalling the package from the application settings in the emulator as you would a normal device. On the next run, it reinstalled and the error went away.

blocks|key|3256942|text|我得到了同样的问题，并通过在模拟器上擦除用户数据来修复它。我的猜测是，模拟器会一直安装项目，除非您擦除数据，因此如果您的新项目与某些内部参数不匹配，它不会喜欢它，也不会重新安装它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3256943|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I got the same problem and fixed it by just wiping the user data on the emulator. My guess is that the emulator keeps the project installed unless you wipe the data, so if your new project doesn't match some internal parameters it doesn't like it and won't reinstall it.

blocks|key|305158|text|我也有同样的问题，并通过卸载应用程序并重新安装来修复它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|305159|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I also had the same problem and fixed it by uninstalling the app and reinstall it again.

blocks|key|3042898|text|啊，我想我找到你的答案了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3042899|Why+does+the+app+signature+change+in+Android+after+a+classpath+change?|offset|length|3042900|如果更改类路径，则会发生更改|3042901|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2458931/why-does-the-app-signature-change-in-android-after-a-classpath-change^0|0|0|1Y|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

ah i think i found your answer:

<a href="https://stackoverflow.com/questions/2458931/why-does-the-app-signature-change-in-android-after-a-classpath-change">Why does the app signature change in Android after a classpath change?</a>

its changed if you change the classpath

blocks|key|305074|text|在搜索和检查手机后，我才知道我目前正在开发这个应用程序的第二个版本，它已经从android市场下载到我的手机中，现在由于这个应用程序是签名的，并且有不同的签名，所以抛出了上面的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|305075|现在，为了解决这个问题，我刚刚从移动端卸载了应用程序，然后再次运行/安装应用程序。|305076|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

After searching and checking the phone, i came to know that i am currently developing 2nd version of this application which is already downloaded from android market in my phone, now as this app is signed and having different signatures this is throwing the above error.

Now, to resolve this issue, i had just uninstalled the app from mobile and run/install the application again.

blocks|key|3043108|text|我在模拟器上也遇到了同样的问题，我运行了命令"adb+uninstall+TheNameOfPackage“。当然，您必须首先转到adb.exe的安装目录，通常是C:\Program+Files\Android\android-sdk\platform-tools，然后运行上面的命令。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3043109|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had the same issue with the emulator and i ran the command "adb uninstall TheNameOfPackage". Of course you must first go to the directory where the adb.exe has been installed, usually C:\Program Files\Android\android-sdk\platform-tools, and then run the above command.

blocks|key|305054|text|对于我来说，在我从家里的机器上复制了所有的keystore文件之后，我必须做一个项目->清理。在那之后，它完美地工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|305055|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me after I copied all of my keystore files from my machine at home, I had to do a Project->clean. After that it worked perfectly.

blocks|key|305147|text|发生此问题后，当我尝试从设备上卸载该应用程序时，无法在我的设备中找到该应用程序。我不知道它去哪了。然后我用adb卸载，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|305148|adb+-d+uninstall+<app+package+name>|code-block|syntax|javascript|305149|这就是与我的问题相似的人的答案。|305150|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

When i tried to uninstall the application from my device after this issue occurs, i cannot able to find the app in my device. I don know where it gone. Then i uninstalled using adb,

<pre><code>adb -d uninstall &lt;app package name&gt;
</code></pre>

This is the answer who are facing the issue similar to my problem.

blocks|key|307146|text|我也有同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|307147|为了修复它，我从我的设备上卸载了项目的旧.apk。|307148|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had the same issue. 

To fix it I uninstalled the old .apk of the project from my device.

blocks|key|3043222|text|转到设备/仿真器设置->应用程序，找到您的应用程序并卸载它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3043223|或|3043224|在Android+Studio打开选项卡"Gradle“(右侧)中，打开：|3043225|appName
..appName
...Tasks
....install
.....uninstallAll|code-block|syntax|javascript|3043226|然后单击此任务两次以执行它。|3043227|重要说明：|offset|length|style|BOLD|3043228|如果卸载后仍然出现此错误，请尝试Build->Clean+Project。|3043229|如果您仍然收到此错误，即使在您的设备设置->应用程序列表中您已经没有此应用程序，请尝试构建->清理项目|3043230|entityMap^0|0|0|0|0|0|0|5|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@$O|14|P|15|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|17|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

Go to device/emulator Settings -> Apps, find your app and uninstall it.

Or 

In Android Studio open tab "Gradle" (on the right side), open: 

<pre><code>appName
..appName
...Tasks
....install
.....uninstallAll
</code></pre>

and click twice on this task to execute it.

Important note:

If you still get this error after uninstalling, try to Build->Clean Project.

If you still get this error, even if in your device Settings->Apps list you have no this app already, try to Build->Clean Project

I moved my Android project to a laptop and now I get this when I hit Debug. Sounds like this is a bug? This shouldn't happen via Eclipse as far as I know.

<pre><code>Re-installation failed due to different application signatures.
</code></pre>

The weirdest thing is this happened after I upgraded sdk/adt and Eclipse to support SDK 2.2 It was working fine earlier, and now it doesn't, so it might be a bug.

Re-installation failed due to different application signatures

我将我的Android项目移到了笔记本电脑上，现在我点击Debug时就会看到这个。听起来像是个bug？据我所知，这不应该通过Eclipse实现。Re-installation failed due to different application signatures.最奇怪的是，这发生在我升级sdk/adt和来支持SDK 2.2之后，早些时候它工作得很好，但现在它不工作了，所以它可能是一个bug

问由于应用程序签名不同，重新安装失败
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